Cleans whiter than white! Extra thick, concentrated, purple horse whitening shampoo removes the most stubborn grass and stable stains, including yellow manure stains, yet is still kind on sensitive skin. See immediate results. This Gallop shampoo is ideal for grey or and problem areas such as the hocks and knees. Contains 6 active ingredients for superior, concentrated cleaning, plus optical brighteners. Extra thick consistency offers easy direct application.